Question

UNIX/LINUX SCRIPT:

Create a named directory and verify that the directory is there by listing all its contents.

Write a shell script to validate password strength. Here are a few assumptions for the password string.  

Length – a minimum of 8 characters.

• Contain alphabets , numbers , and @ # $ % & * symbols.

• Include both the small and capital case letters.

give a prompt of Y or N to try another password and displays an error if anything other than an N or Y is entered.

-If the password doesn’t comply to any of the above conditions, then the script should report it as a “Weak Password” otherwise display a “Strong Password”

If the password is Strong then the strong password will be added to a separate file named password.txt

and lastly display their contents of the password file, then delete the file and the directory and verify both are deleted.

Answer 1

The Shell Script is used in linux OS.

#!/bin/bash
echo "enter the password" //asking users to enter the password
read password //reads the password.
len="${#password}" //initialising the strength

if test $len -ge 8 ; then //applying the password validation in if else loop.

echo "$password" | grep -q [0-9] //grep command is used to search for all the possibility and we are telling users to including the numerical values and the A-Z alphabets

if test $? -eq 0 ; then

echo "$password" | grep -q [A-Z]

if test $? -eq 0 ; then

echo "$password" | grep -q [a-z]

if test $? -eq 0 ; then

echo "$password" | grep -q [$,@,#,%]

if test $? -eq 0 ; then
  
echo "Strong password"

else

echo "weak password include special characters"
  
fi   

else

echo "weak password include lower case character"

fi
else

echo "weak password include capital character"

fi
else

echo "please include the numbers in password it is weak password"   

fi

else

echo "password length should be greater than or equal 8 hence weak password"

fi

Answer 2

#!/bin/bash

while true; do

        echo "Enter password:"

        read pwd

        length="${#pwd}"

        if test $length -ge 8; then

                echo "$pwd" | grep -q [a-zA-Z0-9]

                if test $? -eq 0; then

                        echo "$pwd" | grep -q ["@$#%&*"]

                        if test $? -eq 0; then

                                echo "Strong Password"

                                echo "$pwd" >> Passwords/password.txt

                        else

                                echo "Weak Password"

                        fi

                else

                        echo "Weak Password"

                fi

        else

                echo "Weak Password"

        fi

        read -p  "Try another password(Y or N):" option

        case "$option" in

             N ) break;;

             Y ) ;;

             * ) echo "enter valid option";;

        esac

done

Output